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Switching power supply classification

(1). According to the control method:

Pulse Modulation Converter: The drive waveform is a square wave. PWM, PFM, hybrid.

Resonant converter: The drive waveform is a sine wave. It is divided into ZCS (Zero Current Resonant Switch) and ZVS (Zero Voltage Resonant Switch).

(B). According to the form of voltage conversion:

1.AC/DC: Primary power supply. That is, the rectifier power supply.

2.DC/DC: Secondary power supply.

1) Buck circuit: Step-down chopper, the polarity is the same.

2) Boost: Boost chopper, the polarity is the same.

3) Buck-Boost: The up/down chopper is connected to the opposite polarity and the inductor is transmitted.

4) Cuk: Up/down chopper, the polarity of the input and output is opposite, and the capacitance is transmitted.

(3). According to the top-up structure:

1. Isolated type: There is a transformer.

2. Non-isolated: no transformer.

According to the development of the megatrend, the application of various portable mobile electronic products has led to the rapid development of open switching power supplies.

The open power supply refers to a power supply that has no sealed casing and the circuit board components are exposed outside, and is cooled by natural air cooling. The open power supply is also called an open-plate power supply. Compared with ordinary power sources, it has the advantages of small size, low cost and high efficiency. The disadvantage is higher harmonics. The voltage is unstable and the electromagnetic resistance is weak. Maojie Semiconductor's technical innovations for card-mode switching power supplies have ushered in important technical support for open-ended switching power supplies, resulting in a significant reduction in subharmonics and a constant voltage. Using advanced Mason technology innovative EMI technology,

Power supply layout is one of the most important aspects of successful power supply design. However, everyone has their own views and reasons on how to do this. The truth is that many different solutions are the same; if the design is not really a mess, most power supplies work.

Of course, there are some general rules, such as:

? Do not run sensitive signals in fast switching signals. In other words, do not run feedback tracking under the switch node.

? Ensure that the power load tracking and ground plane size is sufficient to support the current.

? Try to keep at least one continuous ground plane.

? Connect the ground planes with enough vias (usually starting with each via 1A).